Problems with teeth? (Decay)

Cheyenne

I have never in my life had any issues with my teeth! They have always been straight and perfect and white I've always went to my dentist cleanings and never had an issue well when I got pregnant with my son my teeth started to look black underneath only a few of them, and now they look like they are spacing and I can see some of them decaying! Has anyone ever had an issue with this and was it hard to fix? I have extreme problems when it comes to my looks and would lose it if I lost my teeth. Not sure why it's doing this I take my prenatal like I should I'm just not sure why this is happening anyone had any work done on decaying? That can give me some tips and closure?